Features. STMicroelectronics SPC58xNx 32-bit Power Architecture microcontroller, SPC58NN84C3, SPC58NN84E7

Indirect Memory Access (IMA) RM0421

82.3.1 Features

The IMA module includes the following features:

• Able to read all bits in all RAM arrays connected to the IMA, once the IMA is unlocked for reads.

• Enables reading and manipulation of ECC check bits.

• During an IMA SRAM access, other accesses are affected as follows:

– Reads return random data

– Writes have no effect

• Any IMA access to memory are indicated in the Fault Collection and Control Unit

(FCCU).

• IMA accesses to memory do not bypass any SRAM repair which may have occurred during production test of the device.

• IMA accesses to memory use a physical address, not a logical address, and thus memory addresses used by the IMA are not memory mapped.

82.3.2 Block diagram

The following figure shows the structure and function of the IMA module. The Register

Control Block contains the memory-mapped registers accessible by software. The Safety

Block prevents spurious activation of the IMA module. It ensures the IMA does not access

RAM unless the system needs it too.

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